blood vs serum

blood and serum both are nouns.

Word	Noun	Adjective	Verb	Adverb
blood	Yes	No	Yes	No
serum	Yes	No	No	No

blood (noun)	serum (noun)
temperament or disposition	an amber, watery fluid, rich in proteins, that separates out when blood coagulates
the fluid (red in vertebrates) that is pumped through the body by the heart and contains plasma, blood cells, and platelets
the hereditary derivation of an individual
people viewed as members of a group
a dissolute man in fashionable society

blood (verb)	serum (verb)
smear with blood, as in a hunting initiation rite, where the face of a person is smeared with the blood of the kill